Machine for rolling tubes.



PATENTED FEB. 24, 1903. M. MANNESMANN.

MACHINE FOR ROLLING TUBES. APPLIGATION FILED OCT. 10, 1901. RENEWED SEPT. 17, 1902.

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lath/0r PATENTED FEB. 24;, 1903.

v M. MANNES-MANN. MACHINE FOR ROLLING TUBES. A PPLIUATION FILED OUT. 10, 1901. RENEWED SEPT. 17, 1902.

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UNITED STATES 1 PATENT OFFICE.

MAX MANNESMANN, OF REMSOHEID-BLIEDINGHAUSEN, GERMANY.

MACHINE FOR ROLLING TUBES.

SPECIFICATION formingpart of Letters Patent No..721,212, dated February 24, 1903. Application filed-October 10, 1901. Renewed September 1'7, 1902. Serial No. 124,812. (NotmodeL) To all whom it may concern:

Be it known that I, MAX MANNESMANN, a

. citizen of the Empire of Germany, residing at Remscheid-Bliedinghausen, Germany, have invented new and useful Improvements in Machines for Rolling Tubes, of which the following is a specification.

This invention relates to machines for rolling tubes; and it consists (a) in stretchingrolls for first stretching out tubes or other hollow blanks, thereby producing longitudinal feathers, ridges, ribs, fins, or edges on the walls of the tube, of means for working down these feathers or a part thereof in such a way as to cause the metal to flow in a circumferential direction, and thereby stretch the walls of the tube in the direction perpendicular to its axis for the purpose of enlarging the cir-' cumference of the tube without encountering a considerable endwise stretching of the tube, in additional parts consisting of (b) means for producing grooved or flattened portions on the outside of the hollow billet or blank before the sameis'subjectedto the stretchingrolls, in means for cutting off parts of said ribs, ridges, fins, or feathers, and in means for endwise moving the mandrel through the machine.

In the accompanying drawings, which illustrate an apparatus for carrying out my proc ess, Figure 1 shows a longitudinal section through a pair of rolls with a mandrel and a tube between them, the rolls being grooved parallel to the axis of thetube. Fig. 2 shows the same rolls seen from the outgoing end, the mandrel and tube being in cross-section. Fig. 3 is a cross-section of the tube leaving the rolls. Fig. 4: shows a pair of rolls with horizontal axes and small diameter for the endwise stretching of the tube and also a pair of rolls of large diameters with vertical axes for the working or pressing down of the longitudinal feathers on the walls of the tube produced by the first small rolls. These second rolls can produce a great enlargement of the circumference of the tube. Fig. 5 shows the second pair of rolls with a mandrel and tube on enlarged scale seen from the ingoing end. Fig. 6 shows the same from the outgoing end. Fig. 7 is a side elevation, partly in longitudinal section, of a machine compris- "of the tube. V through the hollow billet and tube at the lines ing a set of rolls for producing flattened parts on the circumference of the blank, a set of rolls for longitudinally stretching out said blank with flattened parts into a tube with longitudinal feathers, fins, ribs, or ridges on its outside, a set of rolls for working down said ribs, ridges, and feathers, thereby enlarging the circumference ofthe tube, and a mandrel extending through the whole length Figs. 8 and 11 are cross-sections 8 Sand 11 11. Fig. 9 is'a section after 9 9 in Fig. 7 and shows the cross-section of the tube with flattened side portions and the shapingrolls. Fig. 10 is a section after 10 10 in Fig. 7 and shows the stretching-rolls a a with the mandrel and the tube between them. Fig. 12 is another form of the cross-section of the blank at lines 10 10-, Fig. 7, showing fins or feathers and cutting-tools to cut off a part of the same. Fig. 13 is a plan View of Fig. 12. Fig. 14 is a diagram showing a side View of the rolls in Fig. 7 and a drawing device connected with the forward end of the mandrel. Figs. 15 and 16 are cross-sections through hollow blanks with three or four grooved portions of the outside, which hollow blanks may may be fed to a set of three or four stretching-rolls and by them rolled out into tubes with longitudinal ribs on the outside of the same. 7

Similar letters of reference indicate corresponding parts.

The rolls a. a (shown in Figs. 1, 2, and 4) stretch the tube 0, with the aid of the mandrel h, set between the rolls, endwise,'f0rming upon thev walls of the tube longitudinal feathers o. The tube 0 then goes, in the same or a separate pass through the machine, through the rolls a, which work or press down the feathers c and by the large diameter of these rolls enlarge the tube without stretching the same to any material extent. The tube or hollow blank leaves the rolls in oval form if the mandrel between the rolls a a is cylindrical. It is advisable in all cases to draw the rolled tubes after being rolled out and enlarged through dies, either hot or cold, in order to calibrate them or to bring them to a certain size or form in any other suitable way.

Itis important that the rolls ct ct be of such large dimensions that during the process of working down the feathers no endwise stretching or but very little stretching of the tube occurs. If the rolls a a are of small diameter, an endwise stretching of the tube occurs during the process of workingdown the feathers, which endwise stretching is bad for the tube, as the molecules of the wall are torn apart at the point nearest to the feathers. The revolving speed of the periphery of the rolls is preferably equal to the endwise movement of the mandrel. Instead of rolls to work down the ribs vibrating dies or other appliances may be employed.

Figs. 1 to 6 represent two rolls for the endwise stretching of the hollow blank and the forming of two longitudinal feathers upon the walls of the blank and two rolls for the working down of the feathers without endwise stretching of the tube; but instead of two rolls three or four rolls, forming a caliber, may be used. Instead of two feathers three or more may be formed on the tube. In this case the rolls for working down the feathers must be varied accordingly.

Fig. 7 shows a machine for producing flattened parts c on the outside of the blank with intermediate thicker portions 0 by means of the shaping-rolls a Fig. 0. Two, three, or more, preferably positively driven, rolls may be employed for such shaping. Instead of flattened parts grooved parts may be produced at the outside of the blank by suitably grooving the rolls. The so-shaped hollow blank is then fed to the positively-driven stretching-rolls act, which stretch the hollow blank on the mandrel into the shape shown in Fig. 10, in which two longitudinal ridges or feathers are produced on the outside of the blank. The blank passes then through the rolls a, which work down the ribs 0 and enlarge the circumference of the tube.

A mandrel b extends through the whole length of the hollow blank or tube and has a forward reduced end I) and a shoulder 19 which abuts against the forward reduced end 0 of the hollow blank 0. The forward end 12 of the mandrel is connected with a drawing-chain d of a drawing or pushing device, (shown in Fig. 14,) and the mandrel is drawn through the machine and forces the hollow blank through the machine, the speed of the mandrel being preferably equal to the revolving speed of the caliber of the rolls a a and a a.

Instead of flattened parts a c on the blank 0, Fig. 9, grooved parts on the outside of the hollow blank, as shown in Figs. 15 and 16, may be produced by the shaping-rolls.

When three or four stretching-rolls are employed instead of the two stretching-rolls a a, Fig. 7, three or four flattened or grooved parts It and t on the hollow blanks h and 1', Figs. 15 and 16, may be used, the flattened or grooved parts 71' and '11 coinciding with the edges of the rolls.

Although the employment of flattened or grooved parts on the blank is not necessary in stretching out the hollow blank by the stretching-rolls, such shaping is advisable for reducing or avoiding the ridges on the outside of the tubes or for enabling a very strong reduction between the stretching-rolls, while producing longitudinal ribs on the rolled-out tube of so small dimensions that they can well be worked down by the enlarging-rolls a a. The shaping-rolls a a may be placed in alinement with the stretching-rolls a, a and the enlarging-rolls a a, as shown in Fig. 7, in which case the Whole operation can be performed in one pass through the machine; but each step of the operation may be performed separately by placing the rolls a (tor a a not in alinement or not close to the rolls a a; but the performing of all the steps in one pass through the machine is of advantage, as the whole operation can bemade in one heat without taking the mandrel out off the blanks between two steps. Very important is the performing of the two steps in one pass through the machinefirst, the stretching out and producing the ribs; second, the working down the ribs and enlarging the tube in case the hollow blank is rolled in a heated state. Then the material of the ribs is still hot enough to be worked down in one heat; but when the blank passes first through the stretching-rolls and then in a separate pass through the enlarging-rolls the relatively thin wall of the tube and rib is cooled down and the enlargement is made more difficult.

Instead of shaping-rolls other appliances for shaping or producing hollow blanks with flattened or grooved parts may be employed.

In giving the grooved or flattened parts suitable dimensions ribs on the outside of the tube may be nearly or entirely avoided. In such case the rolls a a can serve to smooth the surface of the tube at those points which have been in contact with the edges of the rolls.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. Inameehanism for rolling tubes thecombination of a set of positively-driven rolls, provided with means for producing longitudinal ribs, ridges or feathers, on the blank during the rolling operation, and appliances for working down said ribs or feathers and IIO enlarging the circumference of the tube on a blank and a second set of rolls, of larger diameter than the first rolls, for rolling downsaid ribs or feathers and producing an enlargement of the tube on the mandrel, substantially as described.

4. A machine for rolling tubes which consists of a set of positively-driven rolls for rolling out a hollow billet or blank, provided with means for producinglongitudinal ribs, ridges or feathers on the blank during the rolling operation, a mandrel, and appliances for working down the ribs, ridges or feathers and enlarging the tube, which appliances are so placed that the rolling out of the'blank and the working down said ribs, ridges or feathers is performed in one pass through the rolling-mill, substantially as described.

5. A machine for rolling tubes which consists of a first set of positively-driven rolls for rolling out the hollow billet or blank and having means for producinglongitudinai ribs, ridges or feathers on the blank during the rollingoperation, and a second set of rolls placed in alinement, with the first rolls, for

rolling down said feathers and enlarging the blank in the same pass, substantially as described.

6. A machine for rolling tubes which consists of a first set of positively-driven rolls having means for rolling out the hollow billetor blank and producing longitudinal ribs, ridges or feathers on the same, and a second set of rolls placed in alinement with the first rolls and of larger diameter than the first rolls, for rolling down the feathers and enlarging the blank in the same pass, substantially as described.

7. A machine for rolling tubes which consists of a set of positively-driven rolls provided with means for rolling out the hollow billet or blank and producing longitudinal ribs, ridges 0r feathers on the blank during the rolling operation, of a mandrel, a drawing or pushing device for moving the mandrel through the rolls, and appliances for working down the ribs, ridges or feathers, substan said billet or blank, of a mandrel, and of a.

drawing or pushing device for moving the mandrel through therolling-mill, substantially as described.

10. A machine for rolling tubes which consists of appliances for producing grooved or flattened parts on the circumference of a h0l-- 10w blank, of a set of positively-driven stretching-rolls provided with means for rolling out said hollow billetorblank, of a mandrel, and of a drawing or pushing device for moving the mandrel through the rolling-mill, and of appliances for working on those parts of the circumference of the tube, that had been in contact with the edges of'the stretching-rolls, substantially as described.

11. A machine for rolling tubes, which consists of appliances for producing grooved or flattened partsat the circumference of ahollow blank, of a set of positively-driven rolls provided with means for rolling out said hollow billet or blank, and producing longitudinal ribs, ridges or feathers on the same during rolling, of a long mandrel extending through the whole length of the rolled-out tube, of appliances for endwise actuating the mandrel and of appliances for working down said ribs ridges or feathers, substantially as described. 4 12. A machine for rolling tubes, which consists of appliances for producing grooved or flattened parts at the circumference of a hollow blank, of a set of positively-driven rolls provided with means for rolling out said hollow billet or blank, and producing longitudinal ribs, ridges or feathers on the same during rolling, of a long mandrel extending through the whole length of the rolled-outtube, of appliances for endwise actuating the mandrel and of appliances for working down said ribs ridges or feathers, all of such appliances and rolls being so located to each other that the whole operation is performed at one pass through the machine, substantially as described.

13. Amachine for rolling tubes, which consists of rolls provided with means for producing grooved or flattened parts at the circum ference of a hollow blank, of a set of positively-driven rolls provided with means for rolling out said hollow billet or blank and producing longitudinal ribs, ridges or feathers on the same during rolling, of a long mandrel extending through the whole length of the rolled-out tube and having a reduced forward end and a shoulder for abutting against the forward reduced or closed end of said hollow blank, of appliances for endwise actuating the mandrel and of appliances for Working down said ribs, ridges or feathers, all such appliances and rolls being in alinement to each other so that the whole operation is performed in one pass, substantially as described.'

14. A machine for rolling tubes, which consists of rolls provided with means for producference of a hollow blank, of a set of positively-driven rolls provided with vmeans for rolling out said hollow billet or blank and producing longitudinal ribs, ridges, fins or feathers on the same during rolling, of a longitudinal mandrel extending through the whole length of the rolled-out tube and havin g a reduced forward end and a shoulder for ing grooved or flattened parts at the circumabutting against the forward reduced or pass through the machine, substantially as :0 closed end of said hollow blank, of appliances described.

for endwise actuating the mandrel, of appli- In testimony whereof I aflix my signature ances for cutting 01? parts of said fins, feathin presence of two witnesses.

5 ers ribs or rid es and of appliances for working down af re st ofsaid ribs, fins, ridges MAX MANNEbMANN' 0r feathers, such appliances and rolls being Witnesses: placed in alinement to each other so that the EMORY H. BOGLEY, whole operation is performed in one single DAVID H. MEAD. 

